contiki/cpu/cc2538/dev/cbc-mac.c

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/*
* Copyright (c) 2016, Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \addtogroup cc2538-cbc-mac
* @{
*
* \file
* Implementation of the cc2538 AES-CBC-MAC driver
*/
#include "contiki.h"
#include "dev/rom-util.h"
#include "dev/cbc-mac.h"
#include <stdbool.h>
#include <stdint.h>
/*---------------------------------------------------------------------------*/
uint8_t
cbc_mac_auth_start(uint8_t key_area, const void *mdata, uint16_t mdata_len,
struct process *process)
{
uint32_t ctrl;
uint32_t iv[AES_IV_LEN / sizeof(uint32_t)];
/* Program AES-CBC-MAC authentication operation */
ctrl = AES_AES_CTRL_SAVE_CONTEXT | /* Save context */
AES_AES_CTRL_CBC_MAC | /* CBC-MAC */
AES_AES_CTRL_DIRECTION_ENCRYPT; /* Encryption */
/* Prepare the crypto initialization vector
* Set initialization vector to 0 */
rom_util_memset(iv, 0, AES_IV_LEN);
return aes_auth_crypt_start(ctrl, key_area, iv, NULL, 0,
mdata, NULL, mdata_len, process);
}
/*---------------------------------------------------------------------------*/
uint8_t
cbc_mac_auth_get_result(const void *mac_in, void *mac_out)
{
uint32_t tag[AES_TAG_LEN / sizeof(uint32_t)];
uint8_t ret;
ret = aes_auth_crypt_get_result(NULL, tag);
if(ret != CRYPTO_SUCCESS) {
return ret;
}
if(mac_in != NULL) {
/* Check MAC */
if(rom_util_memcmp(tag, mac_in, CBC_MAC_MAC_LEN)) {
ret = AES_AUTHENTICATION_FAILED;
}
}
if(mac_out != NULL) {
/* Copy tag to MAC */
rom_util_memcpy(mac_out, tag, CBC_MAC_MAC_LEN);
}
return ret;
}
/** @} */